Buick's midsize sedan gains additional standard safety features for 2006. LaCrosse offers five-place seating with front buckets or six-passenger seating with a flip-and-fold front center seat. Three trim levels are offered. CX and step-up CXL use a 200-hp 3.8-liter V6. The top-line CXS has a 240-hp 3.6-liter V6. CXS comes with a sportier suspension and 17-inch wheels vs. the others' 16s. All use a 4-speed automatic transmission. Every LaCrosse now has standard antilock 4-wheel disc brakes, traction control, and curtain side airbags; those features were optional on most models last year. GM's OnStar assistance system is also standard. Torso side airbags are unavailable. An antiskid system remains an exclusive CXS option. Available features include rear obstacle detection, remote engine start, sunroof, and chrome wheels.